Re: Ada and Mesa

[jsa@organon.com (Jon S Anthony)]

In article <4pkset$cgv@ss2.cs.mci.com> James_Rogers <jrogers> writes:

>  Linking to existing C object files is somewhat easier than linking
> to existing C++ object files.  C++ is more difficult due to the
> symbol name mangling produced so commonly by C++ compilers.  If you
> understand how to navigate the symbol mangling for your compiler
> then calling the function from Ada is easy.

This is just as true for C (or anything else) as Ada.  To interface
C++ to C (with C call into C++) you need to extern C the C++ stuff
to which you want access (whether from Ada or C).  This will keep
the name mangling at bay and you can use standard import pragmas.


>  If you do not understand how to navigate the symbol name mangling
> you will have great difficulty.

No matter what you are using.


>  The Ada compiler simply needs to know that the
> library object being called is a "C" type object, and its correct
> library name.  The C++ symbol mangling causes that correct library
> name to be unexpectedly complex.

I haven't had a chance to look at how GNAT gets around this issue.
Anyone have an elevator version of how ACT solves this problem?


/Jon
-- 
Jon Anthony
Organon Motives, Inc.
1 Williston Road, Suite 4
Belmont, MA 02178

617.484.3383
jsa@organon.com